GLESTriangles.h

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/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */
 
#ifndef META_OCEAN_RENDERING_GLES_TRIANGLES_H
#define META_OCEAN_RENDERING_GLES_TRIANGLES_H
 
#include "ocean/rendering/glescenegraph/GLESceneGraph.h"
#include "ocean/rendering/glescenegraph/GLESIndependentPrimitive.h"
 
#include "ocean/rendering/Triangles.h"
 
namespace Ocean
{
 
namespace Rendering
{
 
namespace GLESceneGraph
{
 
/**
 * This class implements a GLESceneGraph triangles object.
 * This class holds independent and separated triangles and is able to render them.
 * @ingroup renderinggles
 */
class OCEAN_RENDERING_GLES_EXPORT GLESTriangles :
    virtual public GLESIndependentPrimitive,
    virtual public Triangles
{
    friend class GLESFactory;
 
    public:
 
        /**
         * Returns the faces of this triangles object.
         * @see Triangles::faces().
         */
        TriangleFaces faces() const override;
 
        /**
         * Returns the number of triangle faces defined in this primitive.
         * @see Triangles::numberFaces().
         */
        unsigned int numberFaces() const override;
 
        /**
         * Sets the faces of this triangles object.
         * @see Triangles::setFaces().
         */
        void setFaces(const TriangleFaces& faces) override;
 
        /**
         * Sets the faces of this triangles object.
         * @see Triangles::setFaces().
         */
        void setFaces(const unsigned int numberImplicitTriangleFaces) override;
 
        /**
         * Renders the triangles defined by the associated vertex set and the defined triangle faces.
         * @see Renderable::render().
         */
        void render(const GLESFramebuffer& framebuffer, const SquareMatrix4& projectionMatrix, const HomogenousMatrix4& camera_T_object, const HomogenousMatrix4& camera_T_world, const SquareMatrix3& normalMatrix, GLESAttributeSet& attributeSet, const Lights& lights) override;
 
        /**
         * Renders the renderable node.
         * @see Renderable::render().
         */
        void render(const SquareMatrix4& projectionMatrix, const HomogenousMatrix4& camera_T_object, const HomogenousMatrix4& camera_T_world, const SquareMatrix3& normalMatrix, GLESShaderProgram& shaderProgram) override;
 
        /**
         * Draws all triangles with the currently bound shader program.
         */
        void drawTriangles();
 
        /**
         * Draws a subset of all triangles with the currently bound shader program.
         * @param firstTriangle The index of the first triangle to draw, with range [0, numberFaces() - 1]
         * @param numberTriangles The number of triangles to draw, with range [0, numberFaces() - firstTriangle]
         */
        void drawTriangles(const unsigned int firstTriangle, const unsigned int numberTriangles);
 
    protected:
 
        /**
         * Creates a new GLESceneGraph triangles object.
         */
        GLESTriangles();
 
        /**
         * Destructs a GLESceneGraph triangles object.
         */
        ~GLESTriangles() override;
 
        /**
         * Releases the internal vertex buffer object containing the triangle indices.
         */
        void release();
 
        /**
         * Updates the bounding box of this primitive.
         * @see GLESPrimitive::updateBoundingBox().
         */
        void updateBoundingBox() override;
 
    protected:
 
        /// Vertex buffer object for triangle indices.
        GLuint vboIndices_ = 0u;
 
        /// The vertex indices, in case triangles are defined via vertex indices, three for each triangle.
        TriangleFaces explicitTriangleFaces_;
 
        /// Number of triangle faces, in case triangles are defined implicitly based on vertices with consecutive indices.
        unsigned int numberImplicitTriangleFaces_ = 0u;
};
 
}
 
}
 
}
 
#endif // META_OCEAN_RENDERING_GLES_TRIANGLES_H